Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
dao dong » lao dong, ha dong, bat dong
vai cuu » vai cua
dao dan » dao van, cao dang
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sac ky) or (sach y)) lang xa hoi. hieu va nam thuc ((dao dan) OR (dao dong)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sac ky) OR (sach y)) lang xa hoi. hieu va nam thuc ((dao dan) OR (dao dong)) vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sac ky) or (sach y)) lang xa hoi. hieu va nam thuc ((dao dan) OR (dao dong)) vai cuu tre*".